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Let the weight of the original solution be x kg
weight of the salt in x kg solution = 20/100 × x
= X/5
weight of the water in x kg solution= x- x/5
= 4x /5 kg
weight of solution after evaporation = ( x -25) kg
According to given Condition,
x/5 ÷ ( x-25 ) = 30/100
100x /5 = 30x - 750
750 = 30x - 20 x
750 = 10x
x = 75....
Hence the weight of original solution is 75 kg
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